A person suspected of taking part in the attack on the United States Consulate in the Libyan city of Benghazi, in which U.S. Ambassador Christopher Stevens and three other Americans died, has been arrested in Egypt, NBC News reported Saturday.

The suspect in the Benghazi attack last Sept. 11, Mohammed Abu Jamal Ahmed, was nabbed in Cairo where he lives, intelligence sources told the network.

Ahmed, in his late 30s, is also accused of having transported arms from Libya to Egypt and, according to Egyptian intelligence services, he had "active relations" with extremist groups implicated in the Iraq and Afghanistan wars.

NBC said that Ahmed is being interrogated about his role in the arms trade and his relationship with Islamist groups in Egypt and Libya, though for now no formal charges have been brought against him.

Sources questioned by the Wall Street Journal believe the man in custody had connections with Al Qaeda in Yemen.

Ahmed was behind bars in Egypt until the fall of the Hosni Mubarak regime in February 2011, when he managed to escape during the chaos sparked by the ouster of the Egyptian president. He then apparently took part in the armed uprising against Moammar Gadhafi in Libya.

Up to now Libyan authorities have not said whether they have managed to catch anyone directly responsible for the attack on the Benghazi consulate, the subject of a bitter political controversy in the United States.

According to U.S. media, members of Libyan and United States intelligence are weighing the possibility that the attackers were linked to the Ansar al-Sharia group.EFE